chatserver.cpp Example File

chatserver-cpp/chatserver.cpp
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 #include "chatserver.h"

 #include <QDebug>
 #include <QTime>
 #include <QTimer>

 ChatServer::ChatServer(QObject *parent)
     : QObject(parent)
 {
     QTimer *t = new QTimer(this);
     connect(t, &QTimer::timeout, this, &ChatServer::sendKeepAlive);
     t->start(10000);

     m_keepAliveCheckTimer = new QTimer(this);
     m_keepAliveCheckTimer->setSingleShot(true);
     m_keepAliveCheckTimer->setInterval(2000);
     connect(m_keepAliveCheckTimer, &QTimer::timeout, this, &ChatServer::checkKeepAliveResponses);
 }

 ChatServer::~ChatServer()
 {}

 bool ChatServer::login(const QString &userName)
 {
     //stop keepAliveCheck, when a new user logged in
     if (m_keepAliveCheckTimer->isActive()) {
         m_keepAliveCheckTimer->stop();
         m_stillAliveUsers.clear();
     }

     if (m_userList.contains(userName)) {
         return false;
     }

     qDebug() << "User logged in:" << userName;
     m_userList.append(userName);
     m_userList.sort();
     emit userListChanged();
     emit userCountChanged();
     return true;
 }

 bool ChatServer::logout(const QString &userName)
 {
     if (!m_userList.contains(userName)) {
         return false;
     } else {
         m_userList.removeAt(m_userList.indexOf(userName));
         emit userListChanged();
         emit userCountChanged();
         return true;
     }
 }

 bool ChatServer::sendMessage(const QString &user, const QString &msg)
 {
     if (m_userList.contains(user)) {
         emit newMessage(QTime::currentTime().toString("HH:mm:ss"), user, msg);
         return true;
     } else {
         return false;
     }
 }

 void ChatServer::sendKeepAlive()
 {
     emit keepAlive();
     m_keepAliveCheckTimer->start();
 }

 void ChatServer::checkKeepAliveResponses()
 {
     qDebug() << "Keep Alive Check" << m_stillAliveUsers;
     m_userList = m_stillAliveUsers;
     m_stillAliveUsers.clear();
     m_userList.sort();
     emit userListChanged();
 }

 void ChatServer::keepAliveResponse(const QString &user)
 {
     m_stillAliveUsers.append(user);
 }

 QStringList ChatServer::userList() const
 {
     return m_userList;
 }